>The edit box is what I've tried, which gives me .selStart and .selLength, but I have to put up with ugly word wrapping.
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>Modi file or modi comm gives me the option of turning off word wrap, but then I don't have easy access to positioning on the line - .selStart, .selLength. If I turn on the property 'show line/column position' for a modi comm window the row and column will show in the talk area at the bottom of the screen.

Maybe there is an editor activex control out there?

What about using OLE Embedding to embed an MS Word object on the form?